Abstract
Summary A numerical test has been applied to see whether study of deep-focus earthquakes can give information on velocities of P not provided by shallow ones. A layer is considered, beginning at a depth of 0.03a, where the velocity is about 10 per cent more or less than that above it. For the case of low velocity the travel times up to 120 can be made to agree closely with those for a uniform sphere by a suitable choice of origin time and focal depths; but a discrepancy would be revealed if distant observations also are available. For the case of high velocity, the agreement up to 12° cannot be made close, but comparison of direct and indirect waves would give all the information required.
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